What if Leo's head being on fire hadn't been a trick of the light or a figment of Daisy's imagination? What if he truly had fire magic like this character who was so much like him that she didn't know how to tell fiction from reality anymore?
Rukelion Blaze was a fairly miserable character. The only times he was truly happy involved Veronica. Just like how Leo was with Daisy.
In the book, he frequently thought of her as his light. His lifeline. Something to live for after his revenge was complete. Though he did leave her to accomplish his goals, he never truly forgot about her.
He thought of her every day. She helped drive his determination to succeed as quickly as possible. He had promised he would come back to her using the same promise Leo did. The kind that was supposedly the most serious promise he could make.
